clang -S -emit-llvm main.c

main.c

#include <stdio.h>

int factorial(int n, int p) {
	int res = 1;

	for (int i = 0; i < p; i++) {
		res *= n;
	}
	return res;
}

int main() {
	printf("Hello\n");
	int res = factorial(3, 3);
	printf("%d\n", res);
	return 1;
}

main.ll

; ModuleID = 'main.c'
source_filename = "main.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

@.str = private unnamed_addr constant [7 x i8] c"Hello\0A\00", align 1
@.str.1 = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1

; Function Attrs: noinline nounwind optnone sspstrong uwtable
define dso_local i32 @factorial(i32 %0, i32 %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, i32* %3, align 4
  store i32 %1, i32* %4, align 4
  store i32 1, i32* %5, align 4
  store i32 0, i32* %6, align 4
  br label %7

7:                                                ; preds = %15, %2
  %8 = load i32, i32* %6, align 4
  %9 = load i32, i32* %4, align 4
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %11, label %18

11:                                               ; preds = %7
  %12 = load i32, i32* %3, align 4
  %13 = load i32, i32* %5, align 4
  %14 = mul nsw i32 %13, %12
  store i32 %14, i32* %5, align 4
  br label %15

15:                                               ; preds = %11
  %16 = load i32, i32* %6, align 4
  %17 = add nsw i32 %16, 1
  store i32 %17, i32* %6, align 4
  br label %7, !llvm.loop !6

18:                                               ; preds = %7
  %19 = load i32, i32* %5, align 4
  ret i32 %19
}

; Function Attrs: noinline nounwind optnone sspstrong uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 0, i32* %1, align 4
  %3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
  %4 = call i32 @factorial(i32 3, i32 3)
  store i32 %4, i32* %2, align 4
  %5 = load i32, i32* %2, align 4
  %6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %5)
  ret i32 1
}

declare i32 @printf(i8*, ...) #1

attributes #0 = { noinline nounwind optnone sspstrong uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3, !4}
!llvm.ident = !{!5}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 7, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 1}
!4 = !{i32 7, !"frame-pointer", i32 2}
!5 = !{!"clang version 13.0.0"}
!6 = distinct !{!6, !7}
!7 = !{!"llvm.loop.mustprogress"}